[automerger skipped] Add tests for PAC proxies. am: 58f949afcf -s ours

am skip reason: Merged-In I6e7b77320f6baf32ac2f98634fa2e3231d1bf12f with SHA-1 40b524448c is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23609479

Change-Id: Id128760fdf85c14f008a99a2511d883a76ca9a03
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>